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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_Tokenizer_H
#define Patternist_Tokenizer_H
#include <QPair>
#include <QSharedData>
#include <QString>
#include <QUrl>
#include "qparsercontext_p.h"
#include "qtokensource_p.h"
/**
* @file
* @short Contains functions and classes used by the parser and tokenizer.
*/
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
typedef QPair<QString, Expression::Ptr> AttributeHolder;
typedef QVector<AttributeHolder> AttributeHolderVector;
class OrderSpecTransfer
{
public:
typedef QList<OrderSpecTransfer> List;
inline OrderSpecTransfer()
{
}
inline OrderSpecTransfer(const Expression::Ptr &aExpr,
const OrderBy::OrderSpec aOrderSpec) : expression(aExpr),
orderSpec(aOrderSpec)
{
Q_ASSERT(expression);
}
Expression::Ptr expression;
OrderBy::OrderSpec orderSpec;
};
/**
* @short The value the parser, but not the tokenizers, uses for tokens and
* non-terminals.
*
* It is inefficient but ensures nothing leaks, by invoking C++
* destructors even in the cases the code throws exceptions. This might be
* able to be done in a more efficient way -- suggestions are welcome.
*/
class TokenValue
{
public:
QString sval;
Expression::Ptr expr;
Expression::List expressionList;
Cardinality cardinality;
ItemType::Ptr itemType;
SequenceType::Ptr sequenceType;
FunctionArgument::List functionArguments;
FunctionArgument::Ptr functionArgument;
QVector<QXmlName> qNameVector;
QXmlName qName;
/**
* Holds enum values.
*/
EnumUnion enums;
AttributeHolder attributeHolder;
AttributeHolderVector attributeHolders;
OrderSpecTransfer::List orderSpecs;
OrderSpecTransfer orderSpec;
};
}
QT_END_NAMESPACE
/**
* Macro for the data type of semantic values; int by default.
* See section Data Types of Semantic Values.
*/
#define YYSTYPE QPatternist::TokenValue
#include "qquerytransformparser_p.h" /* This inclusion must be after TokenValue. */
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Base class for all tokenizers.
*
* The main entry point is nextToken(), which ones calls to retrieve the stream
* of tokens this Tokenizer delivers.
*
* @see <a href="http://www.w3.org/TR/xquery-xpath-parsing/">Building a
* Tokenizer for XPath or XQuery</a>
* @author Frans Englich <fenglich@trolltech.com>
*/
class Tokenizer : public TokenSource
{
public:
inline Tokenizer(const QUrl &queryU) : m_queryURI(queryU)
{
Q_ASSERT(queryU.isValid());
}
typedef QExplicitlySharedDataPointer<Tokenizer> Ptr;
/**
* Switches the Tokenizer to only do scanning, and returns complete
* strings for attribute value templates as opposed to the tokens for
* the contained expressions.
*
* The current position in the stream is returned. It can be used to
* later resume regular tokenization.
*/
virtual int commenceScanOnly() = 0;
/**
* Resumes regular parsing from @p position. The tokenizer must be in
* the scan-only state, which the commenceScanOnly() call transists to.
*
* The tokenizer will return the token POSITION_SET once after this
* function has been called.
*/
virtual void resumeTokenizationFrom(const int position) = 0;
/**
* @returns the URI of the resource being tokenized.
*/
inline const QUrl &queryURI() const
{
return m_queryURI;
}
virtual void setParserContext(const ParserContext::Ptr &parseInfo) = 0;
protected:
/**
* Returns a string representation of @p token.
*
* This function is used for debugging purposes. The implementation of
* this function is in querytransformparser.ypp.
*/
static QString tokenToString(const Token &token);
private:
Q_DISABLE_COPY(Tokenizer)
const QUrl m_queryURI;
};
}
#undef Patternist_DEBUG_PARSER // disable it for now
QT_END_NAMESPACE
QT_END_HEADER
#endif
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